hg: jdk/sandbox: optimization to avoid retagging and already tagged set of stacktraces

[markus.gronlund at oracle.com]

Changeset: c72ed9929e02
Author:    mgronlun
Date:      2019-08-29 15:16 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/c72ed9929e02

optimization to avoid retagging and already tagged set of stacktraces

! src/hotspot/share/jfr/leakprofiler/checkpoint/objectSampleCheckpoint.cpp
! src/hotspot/share/jfr/leakprofiler/checkpoint/objectSampleWriter.cpp